Method for preparing a resin-treated microporous membrane

Patent metadata

Field	Value
Publication number	US-10173176-B2
Application number	US-201514699219-A
Country	US
Kind code	B2
Filing date	Apr 29, 2015
Priority date	Apr 29, 2015
Publication date	Jan 8, 2019
Grant date	Jan 8, 2019

Abstract

A method for preparing a resin-treated microporous membrane by electrodeposition is disclosed.

First claim

The invention claimed is:

1. A method for preparing a resin-treated microporous membrane comprising a polyolefin matrix material, and finely divided, siliceous filler distributed throughout the matrix material, and a network of interconnecting pores communicating throughout the microporous membrane, wherein the microporous membrane is non-conductive; the method comprising:
(a) coupling the microporous membrane to a charged electrode,
(b) disposing the microporous membrane and the charged electrode into an aqueous dispersion of an ionic resin; the resinous dispersion also containing an oppositely charged or counter electrode forming an electrical circuit with the charged electrode,
(c) passing electric current between the charged electrode and the counter electrode to cause the ionic resinous material to migrate to the charged electrode and consequently to the microporous membrane.

2. The method of claim 1 wherein the resin is electrodeposited on the surface of the microporous membrane.

3. The method of claim 1 wherein the resin is electrodeposited in the pores of the microporous membrane.

4. The method of claim 1 in which the polyolefin matrix material comprises polyethylene.

5. The method of claim 4 in which the polyethylene has an intrinsic viscosity of at least 18 deciliters per gram.

6. The method of claim 1 in which the siliceous material is precipitated silica.

7. The method of claim 6 in which the silica has a volume average gross particle size ranging from 1 to 300 nanometers.

8. The method of claim 1 in which the siliceous filler is present in the matrix material in amounts of at least 50 percent by weight based on total weight of the membrane.

9. The method of claim 1 in which the pores of the membrane have a volume average diameter of 0.02 to 0.5 micrometer.

10. The method of claim 1 in which the ionic resin is a cationic resin and the charged electrode is a cathode.

11. The method of claim 1 wherein the ionic resin is an anionic resin and the charged electrode is an anode.

12. The method of claim 1 in which the microporous membrane is stretched in a single direction or in two directions.

Assignees

• Ppg Ind Ohio Inc

Inventors

• Hellring Stuart D
• Furar Elizabeth A
• Peffer Robin M
• Sandala Michael
• Duffy Shawn
• Votruba-Drzal Peter L

Classifications

• B01D69/148

  Organic/inorganic mixed matrix membranes · CPC title

• B01D67/0079 Primary

  Manufacture of membranes comprising organic and inorganic components · CPC title

• B01D2323/46

  Impregnation · CPC title

• B01D2323/21

  Fillers · CPC title

• C09D5/4411

  Homopolymers or copolymers of acrylates or methacrylates · CPC title